Australia's Santos Ltd (STO.AX: Quote, Profile, Research) owns the majority 50 percent stake in the 123 oil field on the east coast of Vietnam, and the remaining 30 percent is owned by state-run Petrovietnam, SK Energy said.

SK Energy is the country's top refiner with a capacity of running 1.115 million barrels per day (bpd) of crude. (Reporting by Angela Moon; Editing by Jonathan Hopfner)